Light Extraction Grating for Multi-Color Collimated Display
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Solution Overview
Problem
Current display technologies using light extraction gratings can only emit monochromatic light, limiting them to a monochromatic display scheme, which is not suitable for color displays.
Innovation Solution
A light collimation structure comprising a light guide plate with a light extraction unit that includes a grating structure and a light shielding layer, allowing for the extraction of filtered narrow-band spectrum lights of different colors, enabling the creation of collimated lights of multiple colors without the need for polarizers and color film structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a light extraction grating is used, then collimated light can be extracted, but only monochromatic light of a single color can be extracted
Solution Approach 1:
The light extraction grating is divided into multiple sub-gratings, where each sub-grating is responsible for extracting a specific color wavelength range. This segmentation allows the system to extract multiple colors simultaneously while maintaining the collimated light property, resolving the contradiction between color versatility and structural simplicity
Solution Approach 2:
Different regions of the light extraction grating are designed with different local properties - each sub-grating has optimized parameters (such as groove depth, period, and shape) tailored to its specific color extraction function. This local quality approach enables multi-color extraction without requiring a completely different structural design
2Loss of energy
If a light extraction grating is used, then collimated light can be extracted, but light utilization efficiency is low
Solution Approach 1:
The parameters of the sub-gratings (such as groove depth, width, period, and profile shape) are optimized to match the spectral distribution of the light source and the requirements of the display panel. This parameter optimization maximizes the extraction efficiency of collimated light while minimizing energy loss, thereby improving light utilization efficiency without sacrificing illumination intensity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables a colored backlight effect, improves light utilization efficiency, and facilitates mass production by allowing for gray scale control and precise monochromatic light extraction, effectively addressing the limitations of existing technologies.
Implementation Method 1
the filter film is configured to filter lights having a first color, a second color and a third color into the lights having the filtered first color having a narrow band of spectrum
Implementation Method 2
The light extraction unit may comprise a grating structure comprising a plurality of sub-gratings
Implementation Method 3
a light guide plate and a light extraction unit on the light guide plate
Data Source
AI summary
A light collimation structure includes a light guide plate (1) and a light extraction unit (2) on the light guide plate (1). The light extraction unit (2) may be configured to take out lights having a filtered first color having a narrow band of spectrum, a filtered second color having a narrow band of spectrum, and a filtered third color having a narrow band of spectrum in the light guide plate (1) to provide a collimated first color light, a collimated second color light and a collimated third color light.